Webster's New World Medical Dictionary

hyperbilirubinemia
An elevated level of the pig-
ment bilirubin in the blood. A sufficient elevation of
bilirubin produces jaundice. Some degree of hyper-
bilirubinemia is very common right after birth,
especially in premature babies. Treatment of hyper-
bilirubinemia in the newborn involves exposure of
the skin to special lights and removal of serum from
the blood and replacing with solutions free of biliru-
bin (exchange transfusion).
hyperbilirubinemia type 1
See 
Gilbert syndrome.
hypercalcemia
A higher-than-normal level of
calcium in the blood. Hypercalcemia can be a result
of malignancy, elevated parathyroid gland activity
(hyperparathyroidism), or other conditions. It can
cause a number of nonspecific symptoms, including
loss of appetite, nausea, thirst, fatigue, muscle
weakness, restlessness, and confusion. An elevated
level of calcium may cause muscle weakness and
constipation, affect the conduction of electrical
impulses in the heart (heart block), lead to calcium
stones (nephrocalcinosis) in the urinary tract,
impair kidney function, and interfere with the
absorption of iron, predisposing the person to iron
deficiency. 
hydrogen breath test
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hypercalciuria
Excessive excretion of calcium in
the urine, which may cause calcium kidney stones.
Overactivity of the parathyroid gland (hyperparathy-
roidism) may cause excess calcium in the blood-
stream (hypercalcemia) with increased excretion of
calcium in the urine. See also 
hypercalcemia.
hypercapnia
A greater than normal level of car-
bon dioxide in the blood.