Johnson's formula refers to several different equations and products, depending on the context. There is no single, universally accepted "Johnson's formula." To clarify, let's examine the different meanings:
1. Johnson's Formula for Estimating Fetal Weight
This formula is used in obstetrics to estimate fetal weight based on fundal height. The equation is:
Fetal weight (g) = [Fundal height (cm) – n] × 155
Where:
n= 12 if the vertex (baby's head) is above the ischial spine.n= 11 if the vertex is below the ischial spine.
This method provides a quick estimate but is less accurate than ultrasound. It's crucial to remember that this is just an estimate, and the actual birth weight may vary significantly.
2. Johnson's Parabolic Formula (Engineering)
This formula, unrelated to the obstetric formula, is used in engineering to calculate the critical buckling stress of a column. More information can be found on Wikipedia.
3. Johnson's Baby Products Formulas
The "Johnson's" brand produces various baby products, including shampoos and powders, each with its own specific formula. Their baby shampoo is known for its "No More Tears®" formula, designed to be gentle on the eyes. Johnson & Johnson's website provides details on their various product formulations.
4. Mead Johnson (Reckitt) Infant Formulas
Reckitt-Mead Johnson Nutrition produces various infant formulas. These formulas are specifically designed for different dietary needs, such as hypoallergenic formulas like Nutramigen. Information on Mead Johnson formulas can be found on their website. Note that several recalls have affected some of their products in the past.
In summary, "Johnson's formula" is not a singular entity but rather refers to various applications, requiring clarification of context for accurate understanding.
