Table 2.

Parathyroid Hormone Reference Ranges for Various 25-Hydroxyvitamin D Cutoff Values, Shown for Black Study Subjects, White Study Subjects, and Both Collectively

	Black study subjects		White study subjects		Black + white study subjects
Cutoff value (nmol/L)	No.	Reference range*	No.	Reference range*	No.	Reference range*
30 or less	127	18.5–70.0 (17.3–67.5)	27	18.2–76.5 (16.5–77.8)	154	18.2–73.0 (17.2–72.2)
>30	101	14.9–72.7 (14.8–67.2)	234	16.6–61.4 (16.0–62.2)	335	16.6–66.3 (16.0–66.0)
>40	65	14.4–74.9 (13.8–74.6)	206	16.6–59.6 (16.0–59.4)	271	16.5–62.1 (15.7–65.2)
>50	42	19.1–67.6 (19.1–66.0)	172	16.5–60.3 (15.8–59.6)	214	16.5–62.1 (15.8–63.8)
>60	30	19.1–82.2 (20.4–74.6)	131	16.0–59.6 (15.7–59.0)	161	16.5–59.6 (15.8–59.0)
>70	15	19.1–49.5 (20.4–47.1)	109	16.0–66.3 (14.8–65.2)	124	16.0–59.6 (15.7–58.8)
>80	9	23.0–49.5 (20.4–45.4)	82	16.0–59.6 (15.7–58.8)	91	16.0–59.6 (15.7–58.8)
No cutoff	228	16.5–72.7 (17.2–67.5)	261	16.8–61.5 (16.4–62.2)	489	16.6–67.6 (16.6–67.2)

^*Reference ranges (pg/mL) refer to the 2.5 and 97.5 percentiles (values in parentheses are percentiles adjusted for age).