Not an ED diagnosis!
Evaluate for sequelae of associated diseases (e.g. cardiovascular disease, DM) as appropriate
Non-ED workup may include:
BMP
HbA1c
Lipid panel
TSH
+/- Polysomnography to evaluate for OSA
BMP
HbA1c
Lipid panel
TSH
+/- Polysomnography to evaluate for OSA
Metabolic syndrome
Hypertension
Bariatric surgery complications
Hyperlipidemia
Hyperthyroidism
Hyperglycemia
Diabetes mellitus 
Hypothyroidism