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Lab Tests Beginning With F
10 tests in the Lab Values reference begin with the letter F. Every name links to a page with its typical adult range in both unit systems, plain-language notes on high and low results, and preparation notes where they apply.
A B C D E F G H I L M N NUMBERS O P R S T U V W Z
| Test | Abbr. | Typical range (conventional) | Typical range (SI) |
|---|---|---|---|
| Factor VIII | FVIII | 50–150 % | 50–150 % |
| Ferritin | — | Male 30–400; Female 15–150 ng/mL | Male 30–400; Female 15–150 ng/mL |
| Fibrinogen | — | 200–400 mg/dL | 2.0–4.0 g/L |
| Folate, Red Blood Cell | — | 140–628 ng/mL | 317–1,422 nmol/L |
| Folate, Serum | — | 2–20 ng/mL | 4.5–45.3 nmol/L |
| Follicle-Stimulating Hormone | FSH | Male 1.5–12.4; Female 3.5–12.5 (follicular) IU/L | Male 1.5–12.4; Female 3.5–12.5 (follicular) IU/L |
| Free Testosterone | — | Male 9.3–26.5; Female 0–2.2 pg/mL | Male 322–919; Female 0–76 pmol/L |
| Free Thyroxine | Free T4 | 0.8–1.8 ng/dL | 10–23 pmol/L |
| Free Triiodothyronine | Free T3 | 2.3–4.2 pg/mL | 3.5–6.5 pmol/L |
| Fructosamine | — | 200–285 µmol/L | 200–285 µmol/L |
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.