There are no official guidelines to assist in answering this question. I will search for relevant research papers instead.
From the Research
Diagnosis of Hypospadias in Newborns
To diagnose hypospadias in a newborn, the following characteristics should be looked for:
- Displacement of the urethral meatus to the ventral side of the penis 1, 2
- Aberrant ventral curve of the penis referred to as "chordee" 1, 2
- Abnormally arranged foreskin with a "hood" found dorsally and lacking foreskin ventrally 1, 2
- Shortened penis, blunt bulbous tips, ventrally curved shaft with or without chordee 3
- Typical fan shape stream of urinary jet under color Doppler under prenatal ultrasound examination 3
Evaluation of Hypospadias
Evaluation of hypospadias should include:
- Biological and anatomical explorations before surgical intervention, especially in posterior hypospadias, familial hypospadias, or hypospadias associated with other anomalies 4
- Hormonal evaluation (testosterone, AMH) on the first day of life 4
- Investigation of testicular function during the "mini-puberty" period (first 4-6 months of life) 4
Prenatal Diagnosis
Prenatal diagnosis of hypospadias can be made using sonographic findings, including: