---
title: "Immature granulocyte levels: what they are, the normal range on a CBC, and what a high count means"
type: biomarker
url: "https://www.test-well.com/biomarkers/immature-granulocytes"
also_known_as:
  - immature granulocytes
  - immature grans
  - ig
  - ig %
  - immature granulocytes %
  - immature granulocytes (abs)
  - immature grans (abs)
  - promyelocytes, myelocytes and metamyelocytes
category: Blood Health
units:
  - "%"
  - "x10³/µL"
order_price_usd: 17.99
order_item: CBC with Differential Test
order_url: "https://www.test-well.com/tests/cbc-with-differential"
reviewed_at: 2026-11-03
---

# Immature granulocyte levels: what they are, the normal range on a CBC, and what a high count means

> Immature Granulocytes is measured with a standard blood draw; no fasting is needed. A typical reference range is 0 – 2 %. At TestWell it's $17.99 all-in as CBC with Differential Test, results in 1–3 business days, drawn at Quest or Labcorp. An out-of-range result is a prompt to look closer, not a diagnosis.

Immature granulocytes are young neutrophils — promyelocytes, myelocytes and metamyelocytes — that the bone marrow normally keeps until they mature. Modern blood analyzers count them on every CBC with differential, which is why a number most people have never heard of now appears on their report. A healthy adult has almost none; a rise means the marrow is responding to a demand, usually infection or inflammation, and only rarely a marrow disorder.

Also known as: immature granulocytes, immature grans, ig, ig %, immature granulocytes %, immature granulocytes (abs), immature grans (abs), promyelocytes, myelocytes and metamyelocytes.

## Key facts

| Fact | Value |
| --- | --- |
| Units | % / x10³/µL |
| Sample | Blood draw |
| Fasting | Not required |
| Results | 1–3 business days |
| Price | $17.99 |
| Labs | Quest or Labcorp · BioReference in NY/NJ |

## What are immature granulocytes?

Neutrophils — the white cells that fight bacterial infection — are made in the bone marrow over about a week, passing through stages called promyelocyte, myelocyte, metamyelocyte and band before they are released as mature segmented neutrophils. The marrow holds a large reserve of the later stages and, in health, releases only mature cells and a few bands. 'Immature granulocytes' is the analyzer's name for the three earlier stages when they appear in the blood.

Until the 2000s these cells were only counted when a technologist examined a blood film by hand. Automated analyzers (Sysmex, Beckman Coulter, Abbott and others) now identify them by size, granularity and nuclear content and report them on every CBC with differential as a percentage of white cells (IG%) and an absolute count (IG#). That is why the line appeared on reports without anyone ordering it — and why, with the reference range so close to zero, it is flagged so often.

The count measures marrow output under pressure. When the body needs neutrophils quickly, the marrow empties its reserve and starts releasing younger and younger cells — the 'left shift' of older terminology. The immature granulocyte count is a sensitive, early marker of that shift, which is why it rises in the first hours of a bacterial infection and why intensive-care units use it as one of several sepsis markers.

## Who should pay attention to immature granulocytes?

Nobody orders the test by itself; it arrives on a CBC with differential, and the question is what to do when it is flagged. In someone with an obvious infection, inflammation, a recent operation, a pregnancy in its last trimester, a course of steroids or recent chemotherapy, a mild rise is the expected response and needs nothing but a repeat once the trigger has passed. In someone who is well, with a normal white count and a normal differential, a value of 0.5–1% is almost always noise.

The count earns attention when it is raised without an explanation, when it exceeds about 5%, when the total white count is high (above 30 ×10³/µL), when basophils are raised, when other cell lines are low, or when there are night sweats, weight loss, bone pain or an enlarged spleen. Those are the patterns in which a blood film and sometimes a hematology opinion are needed, because they are how chronic myeloid leukemia and other marrow disorders first show.

## How to get tested and prepare

Order a CBC with differential; through TestWell it is collected as a walk-in blood draw at Quest or Labcorp (BioReference in New York and New Jersey), and both laboratories report the immature granulocyte percentage and absolute count. No fasting is required.

Test when you are well if the question is your baseline: an infection, a flare of an inflammatory condition, a recent operation, a hard endurance effort and the days after a vaccine all raise the count for a short time. Note any steroid course, G-CSF injections, pregnancy and recent chemotherapy, each of which raises it for ordinary reasons. Smoking produces a small, persistent rise.

## What is the normal range for Immature Granulocytes?

| Population | Reference range |
| --- | --- |
| age 18+, many analyzers flag above 0.5 | 0 – 2 % |

Reference intervals differ slightly between labs; the range printed on your report is the one to interpret against. Ranges are usually set so 95% of healthy people fall inside them.

## What is the normal immature granulocyte range?

Most laboratories report 0–2% of white cells, with an absolute count of 0–0.1 ×10³/µL; many analyzers flag values above 0.5%, and some laboratories use 0.0–0.5% or 0.0–1.0% as their printed range. A healthy adult typically sits at 0.1–0.3%. Pregnant women in the third trimester and newborns run higher without any disease.

The percentage and the absolute count are read together with the total white count. An IG of 2% when the white count is 6 is 0.12 ×10³/µL of immature cells; the same 2% with a white count of 30 is 0.6 — five times as many — and a different clinical picture. Laboratories flag the absolute count for that reason.

## What does a high immature granulocyte count mean?

That the marrow is releasing neutrophils before they mature. Bacterial infection and sepsis are the most common causes, and the count rises with severity; inflammation of any kind — pancreatitis, an inflammatory bowel disease flare, autoimmune disease, burns, a heart attack — does the same, as do the days after surgery or trauma. Corticosteroids and G-CSF release marrow stores directly. Pregnancy, the newborn period and recovery from chemotherapy are physiological causes.

The uncommon and important causes are disorders of the marrow itself. Chronic myeloid leukemia classically presents with a very high white count, a left shift that reaches all the way to blasts, raised basophils and an enlarged spleen; primary myelofibrosis and polycythemia vera produce a milder version with other clues; acute leukemia and marrow infiltration by cancer or fibrosis produce immature granulocytes together with nucleated red cells (a leukoerythroblastic film), anemia and low platelets. None of these is diagnosed from the immature granulocyte line alone — the blood film and the rest of the count make the distinction.

## What to check next when immature granulocytes are high

Read the count with the total white count, the neutrophil count and the other differential lines, and against the clinical picture. A mild rise with a raised neutrophil count in someone with a recognizable infection or inflammation needs a C-reactive protein, treatment of the cause, and a repeat CBC two to four weeks after recovery; a count that normalizes needs nothing further. Fever with a high count needs cultures and prompt assessment, and fever with low blood pressure, confusion or fast breathing is possible sepsis and an emergency. When the count exceeds about 5%, the white count is above 30 ×10³/µL, basophils are raised, another cell line is low, or there is no explanation, ask for a peripheral blood film review — it shows how far the shift extends and whether blasts or nucleated red cells are present — and a hematology referral follows any blasts, a leukoerythroblastic picture, or a persistent unexplained elevation, with BCR-ABL testing when chronic myeloid leukemia is suspected.

## What does a high Immature Granulocytes mean?

The marrow is pushing out neutrophils faster than it can mature them: infection and sepsis, inflammation, steroids, pregnancy, recovery after chemotherapy, and — with a very high white count or basophils — a myeloproliferative disorder such as CML.

## How do you get tested for Immature Granulocytes?

| Order | Type | Price | Includes |
| --- | --- | --- | --- |
| [CBC with Differential](https://www.test-well.com/tests/cbc-with-differential) | Single test | $17.99 | This marker |
| [General Wellness Panel](https://www.test-well.com/tests/general-wellness-panel) | Panel | $49.99 | 4 tests |
| [Biological Age Panel](https://www.test-well.com/tests/biological-age-panel) | Panel | $59.99 | 3 tests |
| [Baseline Anemia Panel](https://www.test-well.com/tests/anemia-panel) | Panel | $74.99 | 5 tests |
| [Peptide Essentials Panel](https://www.test-well.com/tests/peptide-essentials-panel) | Panel | $89.99 | 4 tests |

## Quest vs Labcorp vs BioReference

| Lab | Available | Price | Notes |
| --- | --- | --- | --- |
| Quest Diagnostics | Yes | $17.99 | Choose Quest at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| Labcorp | Yes | $21.99 | Choose Labcorp at checkout; walk-in patient service centers in every state TestWell serves outside NY and NJ. |
| BioReference (NY & NJ) | Yes | $18.99 | New York and New Jersey orders route here automatically — state rules keep Quest and Labcorp from accepting self-ordered draws. |

- [What a high Immature Granulocytes means (causes, symptoms, next steps)](https://www.test-well.com/biomarkers/immature-granulocytes/high)

## Common questions about Immature Granulocytes

### What are immature granulocytes on a blood test?

Young neutrophils — promyelocytes, myelocytes and metamyelocytes — that the bone marrow normally holds back until they mature. Automated analyzers now count them on every CBC with differential as a percentage and an absolute number. A healthy adult has almost none (0–2%); a rise means the marrow is releasing cells early, usually because of infection or inflammation.

### What is a normal immature granulocyte count?

Most laboratories report 0–2% of white cells and an absolute count of 0–0.1 ×10³/µL; many analyzers flag values above 0.5%, and healthy adults typically sit at 0.1–0.3%. The third trimester of pregnancy and the newborn period run higher normally. The absolute count matters more than the percentage when the total white count is high.

### Why are my immature granulocytes high?

Most often an infection or inflammation — the marrow is pushing out neutrophils before they mature. Steroids, G-CSF, pregnancy, recent surgery or trauma, recovery after chemotherapy and smoking also raise them. A high count with a very high white count, raised basophils, blasts, low platelets or an enlarged spleen is the pattern investigated for a marrow disorder such as chronic myeloid leukemia.

### Should I worry about immature granulocytes of 0.5% or 1%?

Not on their own. Values of 0.5–1% are within or just above many laboratories' ranges, are common during and after minor infections, and are typically noise in someone who feels well with a normal white count and differential. A repeat CBC when well, if anything, is all that is needed; a blood film is reserved for higher values, a high white count or an unexplained persistent rise.

### Do I need a doctor's order to test my immature granulocytes?

No. TestWell's licensed physician network reviews and approves your order — usually within minutes. You can place an order online without an in-person visit or a referral from your own doctor.

### How long does it take to get Immature Granulocytes results?

Most Immature Granulocytes results are available in 1–3 business days after your specimen arrives at the lab. You'll get an email the moment your results are ready, with everything viewable in your TestWell portal.

### How much does a Immature Granulocytes test cost?

Our CBC with Differential Test starts at $17.99. That's the all-in price — no copays, no insurance hoops, no surprise bills. HSA and FSA cards are accepted.

### Do I need to fast before my Immature Granulocytes test?

Fasting is not required for the Immature Granulocytes test. You can have your blood drawn any time of day.

### Which lab will process my Immature Granulocytes test?

Your test will be processed by Quest Diagnostics, Labcorp, or BioReference depending on which is closest to you and which lab carries the test. All three are CLIA-certified and trusted by hospitals nationwide. You'll choose your lab during checkout from 4,000+ locations.

## Keep reading

- [CBC With Differential Explained: What Each Value Means and How to Read Your Results](https://www.test-well.com/guides/cbc-with-differential-explained)
- [How to Read Your Blood Test Results, Line by Line](https://www.test-well.com/guides/how-to-read-your-blood-test-results)
- [Fatigue: which blood tests?](https://www.test-well.com/symptoms/fatigue)
- [Before your test: Recent illness](https://www.test-well.com/prep/recent-illness)
- [Before your test: Prednisone and other corticosteroids](https://www.test-well.com/prep/corticosteroids)
- [Before your test: Exercise](https://www.test-well.com/prep/exercise)

## Sources

- [Labcorp — CBC With Differential/Platelet (test 005009): immature granulocytes reference intervals](https://www.labcorp.com/tests/005009/cbc-with-differential-platelet)
- [Ansari-Lari MA, Kickler TS, Borowitz MJ. Immature granulocyte measurement using the Sysmex XE-2100: relationship to infection and sepsis. Am J Clin Pathol. 2003;120(5):795–9](https://pubmed.ncbi.nlm.nih.gov/14608908/)
- [MedlinePlus (NIH) — Blood differential test](https://medlineplus.gov/lab-tests/blood-differential/)
- [American Society of Hematology — Leukemia (patient education)](https://www.hematology.org/education/patients/blood-cancers/leukemia)

## Related biomarkers

- [Hemoglobin](https://www.test-well.com/biomarkers/hemoglobin)
- [Hematocrit](https://www.test-well.com/biomarkers/hematocrit)
- [White Blood Cell Count](https://www.test-well.com/biomarkers/white-blood-cell-count)
- [Platelet Count](https://www.test-well.com/biomarkers/platelet-count)
- [Red Blood Cell Count](https://www.test-well.com/biomarkers/red-blood-cell-count)
- [MCV](https://www.test-well.com/biomarkers/mcv)

- [Reference range lookup tool](https://www.test-well.com/tools/reference-range-lookup)
- [Lab unit converter](https://www.test-well.com/tools/lab-unit-converter)
- [All biomarkers](https://www.test-well.com/biomarkers)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-11-03. Review policy: https://www.test-well.com/reviewers/youmna-distefano-md

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