Posted by: Satheesh Kumar Muthu | May 2, 2009

Gluteal Injections are less efficaceous in women

More fat and less muscle apparently reduces the efficacy of gluteal intramuscular injections(injections into the buttocks), according to research reported at the 91st annual meeting of the Radiological Society of North America.

In a study of 50 healthy volunteers, it was observed that injections into the buttocks reached muscle in just 8% of women and 32% of men.

In most cases, the needle did not penetrate through the fat layer, even in half of the six patients who were considered underweight (BMI i.e. Body Mass Index less than 20).

Body Mass Index is calculated by the formula:

BMI  =   Body Weight(in kgs)/(Height in metre)2

Unfortunately,there are various standards for the concept of BMI.The exact values of BMI to be considered Normal or Underweight or Overweight or Obese varies according to the standard followed.

Usually,a BMI of between 20 and 25 is considered Normal.

Between 25 and 30 is Overweight.

Greater than 30 indicates Clinical Obesity.

A BMI of less than 20 is considered Underweight.

The above ranges have been considered as the standard by most people. But the World Health Organisation standard differs from this.According to WHO,

Underweight (BMI <18.5),

 Normal weight (BMI = 18.5 to 24.9),

 Overweight (BMI = 25.0 to 29.9), and

Obese (BMI >30.0).


The second is the WHO Asia-Pacific guideline for Asian adults:

 Underweight (BMI <18.5),

Normal weight (BMI = 18.5 to 22.9),

Overweight (BMI = 23.0 to 24.9), and

Obese (BMI >25.0)

Sooooooooo coming to our actual topic…………………It was observed that the majority of those who received a subcutaneous injection were female, and had an average fat thickness greater than 2 cm and a muscle thickness less than 3 cm.

The subjects who got an IM injection were all male, with average fat thickness less than 2 cm and muscle thickness greater than 3 cm.

This study has demonstrated that a majority of people – especially women – are not getting the proper dosage from injections to the buttocks.

Perhaps the upper arm may be a better site than the buttocks in heavier people or in women, or perhaps longer needles are the way to get medicine where it needs to be.



  1. Hi Satheesh 🙂

    Greetings 🙂

    Very interesting, informative and useful post.

    Many thanks

    Have a nice day:)

  2. @Joseph Pulikotil
    Sir, actually I was thinking that posting topics related to my profession wud damage my social relations with people of other professions. If u really liked it, its my pleasure to have myself useful to you by revealing many facts related to Medical study. Thanks a lot for visiting my blog.Happy blogging……

  3. nice information….

  4. nice info!.

    will help me in my clinics!!

  5. @ Prathap
    Hey Prathap,thanks a lot for the compliments. I wud be happy if u point out any mistakes or blunders made by me while posting topics related to medicine.

  6. hiiiiiiiiii
    Good Information !!!
    this type of information is help full for peoples.
    so if i will send you some different type of information then you can Publish in your web page?

    Many thanks !!

    Have a nice day:)

  7. @ Yogendra
    Hi Yogendra thanks a lot for visiting my blog. Keep visiting dude.

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