PEDIATRICS UPDATES
Q#01
What
laboratory features are helpful to distinguish T1D from T2D?
Although classification can usually be made on the basis
of clinical characteristics, measurement of levels of fasting insulin and C-peptide (low in T1D; normal or elevated in T2D) or
islet cell autoantibodies
(positive in T1D; absent in T2D) may be useful to distinguish T1D from
T2D. Be mindful that there can be overlap in the laboratory evaluation.
Q#02
What is acanthosis nigricans?
Acanthosis nigricans is
hyperpigmented and often highly rugated patches that are foundmost prominently
in intertriginous areas, especially on the nape of the neck. This is a marker
of insulin resistance.
Q#03
How is
T2D diagnosed?
The diagnosis of diabetes is based on blood glucose level
cutoffs and the levels used are the same for T1D and T2D. The diagnosis is made
when any of the following criteria are met:
• Random
glucose concentration of 200 mg/dL or higher (if accompanied by classic
symptoms: polyuria, polydipsia, weight loss)
• Fasting
(>8 hours) glucose
concentration of more than 125 mg/dL
• Abnormal
oral glucose tolerance test defined as a glucose concentration of more than 200
mg/dL measured 2 hours after drinking 1.75 g/kg of glucose (with a maximum dose
of 75 g)
• Hemoglobin
A1C≥6.5%
Q#04
Which
pediatric patients should be screened for T2D?
The American Diabetes Association recommends screening
beginning at 10 years of age (or earlier if puberty initiates before age 10
years). Screening should be performed using a fasting plasma glucose, oral
glucose tolerance test, or hemoglobin A1C for patients with the following risk
factors:
• Body
mass index more than 85th percentile for age and sex, plus
• Any
two of following risk factors: positive family history in first- or
second-degree relative; high-risk race/ethnicity; presence of associated conditions
(acanthosis nigricans, hypertension, dyslipidemia, polycystic ovarian syndrome)
• Maternal
history of diabetes or gestational diabetes during the child’s gestation
Q#05
What
hemoglobin A1C level is sufficient to diagnose diabetes?
A level≥6.5%
on two occasions using a laboratory method is sufficient for the diagnosis.
Levels between 5.7 and 6.4 place a person at increased risk for diabetes.