Disease | Laboratory test | ||||
Intact PTH | Serum calcium | Urinary calcium (mg/24 hours) | Ca/Cr clearance | 25OHD | |
PHPT | High-normal or elevated | Elevated | Normal or elevated | 0.01 to 0.05 (>0.02) | Normal, low-normal, or low |
Malignancy | Low (<20 pg/mL) | Elevated | Generally high | Depends on malignancy* | |
FHH | Normal, mildly elevated in 15 to 20 percent | Elevated | Generally low (<100) | <0.01 | Normal |
PHPT with vitamin D deficiency | Elevated | Normal or elevated | Low-normal or low (<200) | Low (<20 ng/mL) | |
Normocalcemic PHPT | Elevated | Normal | Normal | Normal | |
Secondary hyperparathyroidism due to vitamin D deficiency | Elevated | Normal or low | Low | Low (<20 ng/mL) |
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