Screening laboratory tests are done to look for other possible causes of poor growth, including Hypothyroidism (eg, thyroid-stimulating hormone, thyroxine) Renal disorders (eg, electrolytes, creatinine levels) Inflammatory and immune conditions (eg, tissue transglutaminase antibodies, C-reactive protein) Hematologic disorders (eg, complete blood count with differential) Genetic testing for specific syndromes (eg, Turner syndrome) may be indicated by physical findings or if growth pattern differs significantly from family.