Including a Theorem in a section heading

Question

Within my thesis I am attempting to number the studies listed throughout.

I have used a custom theorem style for this:

\newtheorem{study}{Study}

First Issue

I then want to use this within my section headings, so that a section heading will look something like 5.2 Study 1. This is a test

To achieve this, I am using the following code

\section[This is a test]{\protect\begin{study}This is a test\protect\end{study}}

This is both messy, and means that the Study number does not show up in my ToC. Is there a better way to include a theorem in a section heading?

Second Issue

The theorem class puts breaks above and below the study, meaning the formatting of the heading has a line break after the section number, like so:

5.2

Study 1. This is a test

I have attempted to fix this by altering the theoremstyle, but has not worked. I want it to stop linebreaking, and to bold the text after Study 1. The code I am using to attempt that is below

\newtheoremstyle{study2}
  {0} % Space above
  {0} % Space below
  {} % Body font
  {} % Indent amount
  {\bfseries} % Theorem head font
  {:} % Punctuation after theorem head
  {.5em} % Space after theorem head
  {} % Theorem head spec (can be left empty, meaning `normal')

  \theoremstyle{study2} \newtheorem{study}{Study}

How can I remove this line break, and how can I make the whole section heading bold?

Thank you very much in advance for any advice you can give.

Working Example

\documentclass{report}
\usepackage{amsthm}

\newtheoremstyle{study2}
  {0} % Space above
  {0} % Space below
  {} % Body font
  {} % Indent amount
  {\bfseries} % Theorem head font
  {:} % Punctuation after theorem head
  {.5em} % Space after theorem head
  {} % Theorem head spec (can be left empty, meaning `normal')

\theoremstyle{study2} \newtheorem{study}{Study}


\begin{document}
\section[This is a test]{\protect\begin{study}This is a test\protect\end{study}}
\end{document}

Desired Outcome Mock-up

SOLUTION

I have ended up using the following code:

 \newenvironment{study}
  {\enskip\refstepcounter{studyish}\textbf{Study~\thestudyish:\space}}% \begin{shortthm}
  {\enskip}% \end{shortthm}
\makeatother

 \newtheorem{studyish}{Study}

This fixes the line breaking problem. And allows for the Study number to be listed in the ToC. The new section headings look like this:

\section{\protect\begin{study}\label{study:FirstStudy}This is a test\protect\end{study}}

Answer 1

You're on the wrong track. ;-) Just setup a new counter and use it.

\documentclass{book}
\usepackage{xparse}

\newcounter{study}
\NewDocumentCommand{\study}{om}{%
  \refstepcounter{study}\IfValueT{#1}{\label{#1}}%
  \section{Study \thestudy: #2}%
}

\begin{document}
\frontmatter
\tableofcontents

\mainmatter
\chapter{Title}

\section{A regular section}\label{sec:reg}

We'll see in study~\ref{st:first} (see section~\ref{sec:st})
that we're doing interesting things.

\study[st:first]{This is a test}\label{sec:st}

Whatever.

\end{document}

The label for the study number is given as optional argument to \study.

Table of contents

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