Laboratory Testing for Headaches in Pediatric Patients

Indications for Laboratory Testing

The American College of Radiology recommends that laboratory tests are generally not indicated for pediatric headache evaluation unless specific red flags suggest a secondary cause requiring blood work 1, 2, 3
For primary headaches with a normal neurological examination and no red flags, no laboratory testing is required, according to the American College of Radiology 1, 2, 3
A complete neurological examination, including vital signs with blood pressure measurement, is essential in the diagnostic approach for pediatric headaches 3
Blood pressure measurement is mandatory, as hypertension can indicate increased intracranial pressure 3
Fundoscopic examination is essential and should never be skipped, as papilledema indicates increased intracranial pressure 3
The American College of Radiology suggests that pseudotumor cerebri (idiopathic intracranial hypertension) has no specific laboratory tests for diagnosis, but workup may include evaluation for secondary causes such as vitamin A toxicity or endocrinopathies 1, 3
Sickle cell screening may be considered if not previously done and the patient has risk factors, as stroke is a concern in sickle cell disease 3

Papilledema on fundoscopy indicates increased intracranial pressure and requires urgent evaluation 3
Abnormal neurological findings, such as those found in 94% of children with brain tumors, mandate urgent neuroimaging rather than laboratory testing 3
A sudden severe "thunderclap" headache suggests subarachnoid hemorrhage and requires immediate evaluation 3
Headache worsened by Valsalva maneuver suggests Chiari malformation or increased intracranial pressure and requires urgent evaluation 3
Progressive or worsening headache during observation requires immediate evaluation 3
Altered mental status or seizures require urgent evaluation 3

Routine laboratory tests should not be ordered without specific clinical indications, as the yield is extremely low in children with normal examination and no red flags, according to the American College of Radiology 1, 2, 3
Fundoscopic examination should not be skipped, as it is essential for detecting increased intracranial pressure and has higher diagnostic value than routine labs 3
"Sinus headache" should not be diagnosed without considering migraine first, as 62% of pediatric migraineurs have cranial autonomic symptoms that mimic sinusitis 3
Neuroimaging should not be ordered without red flags, as the diagnostic yield is less than 1% for clinically significant findings in children with normal examination 3