Symptom → lab tests
What blood tests are used for easy bruising?
Short answer
Bruising more easily than usual is checked with a CBC (platelet count), prothrombin time/INR (clotting factors), a comprehensive metabolic panel (liver function, since the liver makes clotting factors), and vitamin C, whose deficiency weakens blood vessels. Medications — aspirin, blood thinners, steroids, fish oil — are the most common non-lab cause.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
When should you see a clinician instead of ordering a test?
- Bruising with nosebleeds or gum bleeding that won't stop, blood in urine or stool, or tiny red spots (petechiae) — see a clinician promptly
- Large bruises without any injury, especially with fatigue, fever or bone pain — see a clinician promptly
Why these tests for easy bruising?
Platelets and clotting factors stop bleeding; low platelets, impaired liver function or vitamin K–dependent factor problems lengthen bleeding and produce bruises. Vitamin C deficiency (scurvy) still occurs and causes bruising and gum bleeding. Age-related skin thinning causes harmless forearm bruising that tests won't explain.
Which conditions do these tests help evaluate?
- Anemia — CBC, iron studies, ferritin, B12 and folate to find the cause of fatigue and low energy.
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 |
|---|---|---|---|---|
| Blood Clotting PanelSaves $50.97 vs ordering the tests separately | Panel · 4 tests | $149.99 | No | 3–7 business days |
| CBC with Differential | Test · 14 biomarkers | $21.99 | No | 1–3 business days |
| Prothrombin Time with INR | Test · 2 biomarkers | $23.99 | No | 1–3 business days |
| Comprehensive Metabolic Panel | Test · 14 biomarkers | $22.99 | Yes | 1–3 business days |
| Vitamin C (Ascorbic Acid) | Test | $44.99 | Yes | 3–7 business days |
| Ferritin | Test | $24.99 | No | 1–3 business days |
Common questions
Does easy bruising mean a bleeding disorder?
Usually not — medications, aging skin and minor knocks explain most of it. Tests find the minority with low platelets, liver disease or clotting-factor problems, which is why the screen is worth doing when bruising is new or unexplained.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.