Symptom → lab tests
What blood tests check the causes of frequent urination?
Short answer
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.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
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 — A1c, fasting glucose and insulin to screen for prediabetes and diabetes.
Which tests, and what do they cost?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Diabetes Screening PanelSaves $9.98 vs ordering the tests separately | Panel · 3 tests | $59.99 | Yes | 2–5 business days |
| Kidney Health PanelSaves $36.97 vs ordering the tests separately | Panel · 4 tests | $64.99 | Yes | 2–4 business days |
| Hemoglobin A1c | Test | $21.99 | No | 2–4 business days |
| Glucose, Fasting | Test | $24.99 | Yes | 1–3 business days |
| Urinalysis, Complete | Test · 10 biomarkers | $17.99 | No | 1–3 business days |
| Comprehensive Metabolic Panel | Test · 14 biomarkers | $22.99 | Yes | 1–3 business days |
| PSA, Total | Test | $28.99 | No | 1–3 business days |
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.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.