Two laboratories may use different reference ranges for what is considered normal and abnormal, making results from different labs difficult to compare.
Notes on verification
Confirmed by multiple independent, authoritative medical sources (MedlinePlus, Merck Manual, JABFM, Testing.com) that converge on the same fact regarding variability in lab reference ranges. [tier=gold indep_score=0.838 clusters=4 claim_tier=notable | kind=empirical eligibility=high]
Sources
- Lab Test Results Guide: What to Expect - WebMD (seed:health_and_medicine)
- https://www.merckmanuals.com/professional/resources/normal-laboratory-values/laboratory-reference-ranges (corroboration)
- https://www.medlineplus.gov/lab-tests/how-to-understand-your-lab-results/ (corroboration)
- https://www.jabfm.org/content/38/1/174.full (corroboration)
- https://www.testing.com/articles/laboratory-test-reference-ranges/ (corroboration)