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Related Experiment Videos

Nephrogenous cyclic AMP as a parathyroid function test.

A E Broadus

    Nephron
    |January 1, 1979
    PubMed
    Summary
    This summary is machine-generated.

    Nephrogenous cyclic AMP (NcAMP) in urine is a sensitive indicator of parathyroid function. Measuring NcAMP effectively assesses parathyroid activity and calcium metabolism disorders.

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    Area of Science:

    • Biochemistry
    • Endocrinology
    • Nephrology

    Background:

    • Urinary cyclic AMP (cAMP) originates from filtered load and kidney synthesis (nephrogenous cAMP, NcAMP).
    • NcAMP is the sole readily quantifiable in vivo nucleotide pool, reflecting active parathyroid hormone effects.
    • NcAMP measurement offers a specific index for assessing parathyroid hormone activity.

    Purpose of the Study:

    • To evaluate nephrogenous cAMP (NcAMP) as a sensitive index of parathyroid function.
    • To assess the utility of NcAMP in diagnosing hyperparathyroidism and related calcium metabolism disorders.
    • To determine the effectiveness of NcAMP in evaluating parathyroid suppressibility.

    Main Methods:

    • Quantification of NcAMP in urine samples.
    • Correlation of NcAMP levels with parathyroid function status (primary hyperparathyroidism, suppressed parathyroid function).

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  • Utilizing 'calcium injection test' and 'oral calcium tolerance test' to assess parathyroid suppressibility.

    • Main Results:

    • Elevated NcAMP levels (4.64 +/- 1.95 nmol/100 ml GF) observed in over 90% of primary hyperparathyroidism patients.
    • Low NcAMP levels (0.31 +/- 0.16 nmol/100 ml GF) found in individuals with absent or suppressed parathyroid function.
    • NcAMP measurement demonstrated sensitivity across the full spectrum of parathyroid activity.

    Conclusions:

    • NcAMP is a sensitive and optimal indicator for assessing parathyroid function.
    • NcAMP measurement aids in evaluating parathyroid suppressibility in response to calcium administration.
    • NcAMP-based tests are valuable for diagnosing subtle calcium metabolism disorders.