---
title: "What blood tests check the causes of frequent urination?"
type: symptom
url: "https://www.test-well.com/symptoms/frequent-urination"
symptom: Frequent urination
aliases:
  - peeing a lot
  - urinating often blood test
  - excessive urination
reviewed_at: 2026-09-06
review_status: reviewed
date_published: 2026-09-05
lab_fee_usd: 6
---

# What blood tests check the causes of frequent urination?

> Frequent urination with thirst is a classic sign of high blood sugar, so hemoglobin A1c and fasting glucose come first, with a urinalysis to check for infection, glucose and protein and a metabolic panel for kidney function and calcium. In men over 50, PSA and a prostate evaluation are part of the picture.


## When should you see a clinician instead of ordering a test?

- Frequent urination with extreme thirst, nausea, vomiting, deep rapid breathing or confusion — emergency care (possible diabetic ketoacidosis)
- Painful urination with fever or back pain — see a clinician the same day
- Blood in the urine — see a clinician

## Why these tests for frequent urination?

When glucose runs high, the kidneys spill it into urine and pull water with it. A1c shows the three-month average; fasting glucose the current level; urinalysis detects glucose, infection and protein; the CMP checks kidney function, electrolytes and calcium (high calcium also causes urination and thirst).

## Which conditions do these tests help evaluate?

- [Diabetes & Blood Sugar](https://www.test-well.com/conditions/diabetes-screening) — A1c, fasting glucose and insulin to screen for prediabetes and diabetes.

## Which tests, and what do they cost?

| Test or panel | Type | Price | All-in (one item + $6 fee) | Fasting | Results |
| --- | --- | --- | --- | --- | --- |
| [Diabetes Screening Panel](https://www.test-well.com/tests/diabetes-screening-panel) | Panel (3 tests) | $59.99 | $65.99 | Yes | 2–5 business days |
| [Kidney Health Panel](https://www.test-well.com/tests/kidney-health-panel) | Panel (4 tests) | $64.99 | $70.99 | Yes | 2–4 business days |
| [Hemoglobin A1c](https://www.test-well.com/tests/hemoglobin-a1c) | Test | $21.99 | $27.99 | No | 2–4 business days |
| [Glucose, Fasting](https://www.test-well.com/tests/glucose-fasting) | Test | $24.99 | $30.99 | Yes | 1–3 business days |
| [Urinalysis, Complete](https://www.test-well.com/tests/urinalysis) | Test | $17.99 | $23.99 | No | 1–3 business days |
| [Comprehensive Metabolic Panel](https://www.test-well.com/tests/comprehensive-metabolic-panel) | Test | $22.99 | $28.99 | Yes | 1–3 business days |
| [PSA, Total](https://www.test-well.com/tests/psa-total) | Test | $28.99 | $34.99 | No | 1–3 business days |

Prices are cash-pay; every order adds one $6.00 lab processing fee. Physician authorization included.

## Common questions

### Is a urinalysis or a blood test better for frequent urination?

They answer different questions: urinalysis finds infection, blood, protein and glucose in urine; A1c and glucose measure blood sugar. Together they cover the common causes.

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- [All symptoms](https://www.test-well.com/symptoms)
- [Browse by condition](https://www.test-well.com/conditions)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-06. Review policy: https://www.test-well.com/editorial-policy

Canonical page: https://www.test-well.com/symptoms/frequent-urination
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.