Symptom → lab tests
What blood tests check for causes of night sweats?
Short answer
Night sweats are most often hormonal — perimenopause and menopause in women, low testosterone in men — or thyroid-related, and those are testable: FSH, LH, estradiol, TSH with Free T4, and a CBC. Drenching sweats with fever, weight loss or swollen glands are a different category that needs a clinician, not a test kit.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
When should you see a clinician instead of ordering a test?
- Drenching night sweats with fever, unexplained weight loss, persistent cough or swollen lymph nodes — see a clinician promptly
Why these tests for night sweats?
Falling estrogen produces hot flashes and night sweats around menopause; FSH rises as the ovaries slow. Hyperthyroidism raises heat production. The CBC and inflammation markers screen for infection and blood disorders, which are the reason night sweats with other systemic symptoms are taken seriously.
Which conditions do these tests help evaluate?
- Perimenopause — Estradiol, FSH, LH and thyroid to make sense of changing cycles and symptoms.
- Thyroid Problems — TSH, Free T4/T3 and antibodies to evaluate an under- or over-active thyroid.
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 |
|---|---|---|---|---|
| Menopause & Perimenopause Test PanelSaves $92.93 vs ordering the tests separately | Panel · 8 tests | $179.99 | No | 2–4 business days |
| Comprehensive Thyroid Test (TSH, Free T4, Free T3, Reverse T3, TPO)Saves $10.97 vs ordering the tests separately | Panel · 4 tests | $109.99 | No | 3–7 business days |
| Women's Hormone PanelSaves $129.90 vs ordering the tests separately | Panel · 11 tests | $239.99 | No | 3–5 business days |
| FSH Test (Follicle Stimulating Hormone) | Test | $29.99 | No | 2–4 business days |
| LH Test (Luteinizing Hormone) | Test | $36.99 | No | 1–3 business days |
| Estradiol Test (E2) | Test | $35.99 | No | 1–3 business days |
| TSH Test (Thyroid Stimulating Hormone) | Test | $26.99 | No | 1–3 business days |
| Free T4 Test (Thyroxine) | Test | $23.99 | No | 1–3 business days |
| CBC with Differential Test | Test · 14 biomarkers | $21.99 | No | 1–3 business days |
| C-Reactive Protein Test (CRP) | Test | $26.99 | No | 2–4 business days |
| Testosterone Test (Total) | Test | $33.99 | No | 1–3 business days |
Common questions
Can hormone tests confirm perimenopause?
They support it — a rising FSH and falling estradiol fit the picture — but levels swing day to day during perimenopause, so a single normal result doesn't exclude it. Symptoms and cycle history carry the diagnosis.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.