Low
Also written as: L, Decreased, Below Range
Simple Meaning
Your value is below the lab's reference range for that test.
Where it appears in reports
As an 'L' flag, bold text, or a down-arrow beside a result.
Why it matters
Like high flags, low flags need context. Some lows (vitamin D, hemoglobin) are common and fixable; others need more evaluation. Your doctor decides which lows matter for you.
Doctor advice needed
Report words describe findings — they are not diagnoses. What "Low" means for you depends on your symptoms, history, and other results. Always review your report with your doctor.
Frequently Asked Questions
Your value is below the lab's reference range for that test. If you are unsure what it means for you, ask your doctor.
Like high flags, low flags need context. Some lows (vitamin D, hemoglobin) are common and fixable; others need more evaluation. Your doctor decides which lows matter for you. On its own it is not a diagnosis — it needs clinical correlation with your symptoms and other results. Consult your doctor for guidance.
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Related Tests
Disclaimer: This information is for patient education only and does not replace medical advice,
diagnosis, or treatment. Always consult a qualified doctor.