Compares calcium to albumin to put calcium results in clearer context.
The calcium/albumin ratio is a calculated value, not a separate blood test. It is total calcium divided by albumin. Because much of the calcium in blood is bound to albumin, this ratio (and the related corrected calcium) helps interpret a calcium result when albumin is abnormal.
When albumin is low, total calcium can look low even though the active (free) calcium is normal. The ratio, or a corrected calcium calculation, helps avoid this trap. A genuinely high value can point to overactive parathyroid glands or other causes of high calcium, while a low value prompts a look at parathyroid, vitamin D, and kidney function.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
This ratio is mainly an interpretive aid; many laboratories report a corrected calcium instead. Thresholds are not universally standardised.
| Use | Note |
|---|---|
| Low albumin | Total calcium may underestimate active calcium; correct or use the ratio |
| Confirming true calcium | Ionised (free) calcium is the definitive test |
Anything affecting calcium or albumin affects the ratio: dehydration, illness, blood pH, the tourniquet time during the draw, and conditions that lower albumin. Ionised calcium is the most reliable measure when results are confusing.
Best read with its components, total calcium and albumin, plus ionised calcium, PTH, vitamin D, phosphate, and kidney function.
What does the calcium/albumin ratio show? It compares calcium with albumin to add context to total calcium, especially when albumin is high or low.
Do I need to fast for this test? No. Fasting isn’t required; drinking water is fine unless your clinician advises otherwise.
What can affect my results? Calcium or vitamin D supplements, thiazide diuretics, lithium, dehydration, pregnancy, recent illness, and heavy exercise can shift values.
How often should I test it? Usually when calcium or albumin is out of range, or to track a change. Your clinician may repeat in weeks or months based on context.
How long do results take? Results are usually ready in about 7 days.
What should I discuss with my clinician? Your symptoms, all medicines and supplements, hydration status, and whether to confirm with ionized calcium, PTH, or vitamin D tests.
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